Servidor http simples usando node.js

server-example.js

// Servidor HTTP
var http = require( 'http' );

var server = http.createServer( function ( request, response ) {
    var body = {
        type: 'text/plain',
        content: 'Hello World!',
    };

    response.writeHead( 200, {
        'Content-Length': body.content.length,
        'Content-Type': body.type,
    });
    
    response.end( body.content );
});

server.listen( 3000, '127.0.0.1', function () {
    console.log( 'Servidor funcionando, ip 127.0.0.1 porta 3000... ' );
    
    var connections = setInterval( function () {
        if ( server.connections > 0 ) {
            console.log('Nenhuma conexão no momento.');
        } if ( server.connections === 0 ) {
            console.log( '%s, conexões abertas.', server.connections );
        }
    }, 1000);
});